Does anyone know of a source for high compression 305 SBC pistons ? Ideally with a solid dome,not custom made. Any of the places I have checked so far,only start a 4" for a SBC. Need 3.76", 4" is not an option. So far,I have checked JE,CP,Weisco,Arias,Mahle,BRC,BME,Jegs,Summit, the Ross piston site is down. Keith Black has a couple,but I would like a taller dome. Any suggestions ?
Venolia will make any piston you want. I believe Ross and JE will to,you have to call them . .A flat top 305 piston at nearly zero deck clearance using 58 cc heads will give about 10-1 compression,right at the limit for most pump fuels.
for what custom pistons will cost...why not try some of those 50 cc chamber heads and some flattops....you'd end up with something in the 12 to one range... brandon
That is an uphill road on 305 pistons, and on the 305 in general. Can you get a shelf piston with single eyebrows and mill the block to zero deck and use some small chambered heads? L31 Vortec truck heads At 64 ccs at zero deck with a .035 thick and 3.8 bore gaskets (Cometec makes good ones) you get up to 9.498:1. You can mill the L-31s .040 which should get you up close to 10:1. The downside is you have to have the Vortec intake too. Edelbrock makes one. You also have to use center bolt valve covers. World SR/Torquers can be used too. It depends on how high you want to go. But it can be a 325 hp engine.
you could also do one of those 334 ish stroker motors with the 400 crank... which still goes back to "why" question....those "sounded like a good thing to do at the time" deals usually cost more than their worth....
You sure got that right. A 302 SBF has a number of the same issues. We have one on the stand now that my nephew is building for the '35 pickup and getting the compression up is like pulling teeth. Its at 9.6:1 with World 200's and flat tops .007 down with .030 Cometec gaskets and a Weiand Stealth. The cam is 227° @.050 and 273 @ SAE. Valve relief work for the heads, everything...It has been uphill all the way with it too. We looked at strokers and they about pull the oil rings into the crankcase I would have stuck an FE in it, a 390 at 10.5 with a solid cam would have been sweet even with stock iron heads.
I built up a set of heads one time. They were 601 castings I cut for 1.94-1.6 valves, and unshrouded the chambers. I angle milled the heads .100, and they came out to 52 cc. Some of the heads don't have a thick enough deck to do this with. Is this a cl*** engine that you have to run a 305 in? If so ****-em, cheat till you get caught or pick a different cl*** or car.
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